M&S Sparks card single use coupon - how many items?

[madeinmanc]

I've got a coupon on my Sparks card for 15% off chocolate bars. It says "Single use offer. Can only be used once in a single transaction", I'm thinking this means only one chocolate bar. Is this right? Or if I bought a few bars would that be using it once? 🤔

My local M&S is really busy so I'd rather know for sure in advance than hold up a queue.

It would normally ne a discount off one item.

@popandchoc Thanks, I thought so but wanted to confirm. In Lidl it's more than one item.